Added test for “simple” export.

tests/test_simple.cpp

@@ -0,0 +1,72 @@
+/*  This file is part of remwharead.
+ *  Copyright © 2019 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <exception>
+#include <string>
+#include <sstream>
+#include <regex>
+#include <chrono>
+#include <catch.hpp>
+#include "sqlite.hpp"
+#include "simple.hpp"
+
+using std::string;
+using std::chrono::system_clock;
+using std::regex;
+using std::regex_search;
+
+SCENARIO ("The Simple export works correctly")
+{
+    bool exception = false;
+    bool simple_ok = true;
+
+    GIVEN ("One database entry")
+    {
+        Database::entry entry;
+        entry.uri = "https://example.com/page.html";
+        entry.tags = { "tag1", "tag2" };
+        entry.title = "Nice title";
+        entry.datetime = system_clock::time_point();
+        entry.fulltext = "Full text.";
+        entry.description = "Good description.";
+
+        try
+        {
+            std::ostringstream output;
+            Export::Simple({ entry }, output).print();
+            const string simple = output.str();
+
+            const regex re("[0-9]{4}-[0-9]{2}-[0-9]{2}: Nice title\n"
+                           " {12}<https://example\\.com/page\\.html>\n");
+
+            if (!regex_search(simple, re))
+            {
+                simple_ok = false;
+            }
+        }
+        catch (const std::exception &e)
+        {
+            exception = true;
+        }
+
+        THEN ("No exception is thrown")
+            AND_THEN ("Output looks okay")
+        {
+            REQUIRE_FALSE(exception);
+            REQUIRE(simple_ok);
+        }
+    }
+}